feat: add Docker support and bot configuration

- Introduced Dockerfile for building the bot application using Go.
- Added .dockerignore to exclude unnecessary files from the Docker context.
- Updated docker-compose.yml to define the bot service and its dependencies, including environment variables for database and Lavalink configuration.
- Modified internal configuration to streamline environment variable handling.

Dockerfile

@@ -0,0 +1,21 @@
+# Build stage
+FROM golang:1.22-alpine AS builder
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -o /velox-bot .
+
+# Run stage
+FROM alpine:3.19
+
+RUN apk add --no-cache ca-certificates tzdata
+
+WORKDIR /app
+
+COPY --from=builder /velox-bot .
+
+ENTRYPOINT ["./velox-bot"]